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Therapeutic Effect of Venotonics in Chronic Venous Insufficiency

A Meta-Analysis

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Abstract

Objective: To evaluate, by means of a review of published data, the therapeutic effectiveness of drugs administered orally in the treatment of chronic venous insufficiency.

Data Sources: A computerised literature database, MEDLINE, was used to search for reports written in English, German, North European or Latin-based languages and published between 1980 and 1998. References including the following key words or medical subjects were retrieved: ‘venous insufficiency or varicose veins’ combined with ‘drug therapy’. The Iowa Drug Information Service and the Cochrane Library were used as complementary databases.

Study Selection: Studies were included if they were randomised, double-blind, placebo-controlled clinical trials of at least 4 weeks’ duration in patients receiving oral treatment only.

Data Extraction: Data pertaining to subjective and objective symptoms that were usually reported in the follow-up of patients with chronic venous insufficiency were abstracted independently and blindly by both authors.

Statistical Methods: A qualitative meta-analysis was carried out to assess the quality of the published reports. A quantitative analysis based on changes in subjective and objective symptoms was performed by combining data obtained after using different drugs. Classic standard statistical methods [pooled odds ratio (OR) and 95% confidence intervals (CIs) for subjective symptoms and pooled ‘z’ and ‘p’ for objective symptoms] were employed.

Data Synthesis: In total, 21 reports were analysed. Out of a maximum score of 100 points, these studies averaged 64.4 points. Drug therapy improved heaviness of legs (pooled OR 0.26; CI 0.17 to 0.39; χ 2= 4.04). The results also suggested that drug therapy could produce a decrease in limb perimeter accompanied by a decrease in venous capacity and an increase in venous outflow.

Conclusion: The present analysis permits the conclusion that oral administration of venotonics may improve the heaviness of legs in patients with chronic venous insufficiency. An increase in venous outflow was also suggested by the data obtained.

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Correspondence to José N. Boada.

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Boada, J.N., Nazco, G.J. Therapeutic Effect of Venotonics in Chronic Venous Insufficiency. Clin. Drug Investig. 18, 413–432 (1999). https://doi.org/10.2165/00044011-199918060-00001

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